//  json2.js
//  2016-05-01
//  Public Domain.
//  NO WARRANTY EXPRESSED OR IMPLIED. USE AT YOUR OWN RISK.
//  See http://www.JSON.org/js.html
//  This code should be minified before deployment.
//  See http://javascript.crockford.com/jsmin.html

//  USE YOUR OWN COPY. IT IS EXTREMELY UNWISE TO LOAD CODE FROM SERVERS YOU DO
//  NOT CONTROL.

//  This file creates a global JSON object containing two methods: stringify
//  and parse. This file is provides the ES5 JSON capability to ES3 systems.
//  If a project might run on IE8 or earlier, then this file should be included.
//  This file does nothing on ES5 systems.

//      JSON.stringify(value, replacer, space)
//          value       any JavaScript value, usually an object or array.
//          replacer    an optional parameter that determines how object
//                      values are stringified for objects. It can be a
//                      function or an array of strings.
//          space       an optional parameter that specifies the indentation
//                      of nested structures. If it is omitted, the text will
//                      be packed without extra whitespace. If it is a number,
//                      it will specify the number of spaces to indent at each
//                      level. If it is a string (such as "\t" or "&nbsp;"),
//                      it contains the characters used to indent at each level.
//          This method produces a JSON text from a JavaScript value.
//          When an object value is found, if the object contains a toJSON
//          method, its toJSON method will be called and the result will be
//          stringified. A toJSON method does not serialize: it returns the
//          value represented by the name/value pair that should be serialized,
//          or undefined if nothing should be serialized. The toJSON method
//          will be passed the key associated with the value, and this will be
//          bound to the value.

//          For example, this would serialize Dates as ISO strings.

//              Date.prototype.toJSON = function (key) {
//                  function f(n) {
//                      // Format integers to have at least two digits.
//                      return (n < 10)
//                          ? "0" + n
//                          : n;
//                  }
//                  return this.getUTCFullYear()   + "-" +
//                       f(this.getUTCMonth() + 1) + "-" +
//                       f(this.getUTCDate())      + "T" +
//                       f(this.getUTCHours())     + ":" +
//                       f(this.getUTCMinutes())   + ":" +
//                       f(this.getUTCSeconds())   + "Z";
//              };

//          You can provide an optional replacer method. It will be passed the
//          key and value of each member, with this bound to the containing
//          object. The value that is returned from your method will be
//          serialized. If your method returns undefined, then the member will
//          be excluded from the serialization.

//          If the replacer parameter is an array of strings, then it will be
//          used to select the members to be serialized. It filters the results
//          such that only members with keys listed in the replacer array are
//          stringified.

//          Values that do not have JSON representations, such as undefined or
//          functions, will not be serialized. Such values in objects will be
//          dropped; in arrays they will be replaced with null. You can use
//          a replacer function to replace those with JSON values.

//          JSON.stringify(undefined) returns undefined.

//          The optional space parameter produces a stringification of the
//          value that is filled with line breaks and indentation to make it
//          easier to read.

//          If the space parameter is a non-empty string, then that string will
//          be used for indentation. If the space parameter is a number, then
//          the indentation will be that many spaces.

//          Example:

//          text = JSON.stringify(["e", {pluribus: "unum"}]);
//          // text is '["e",{"pluribus":"unum"}]'

//          text = JSON.stringify(["e", {pluribus: "unum"}], null, "\t");
//          // text is '[\n\t"e",\n\t{\n\t\t"pluribus": "unum"\n\t}\n]'

//          text = JSON.stringify([new Date()], function (key, value) {
//              return this[key] instanceof Date
//                  ? "Date(" + this[key] + ")"
//                  : value;
//          });
//          // text is '["Date(---current time---)"]'

//      JSON.parse(text, reviver)
//          This method parses a JSON text to produce an object or array.
//          It can throw a SyntaxError exception.

//          The optional reviver parameter is a function that can filter and
//          transform the results. It receives each of the keys and values,
//          and its return value is used instead of the original value.
//          If it returns what it received, then the structure is not modified.
//          If it returns undefined then the member is deleted.

//          Example:

//          // Parse the text. Values that look like ISO date strings will
//          // be converted to Date objects.

//          myData = JSON.parse(text, function (key, value) {
//              var a;
//              if (typeof value === "string") {
//                  a =
//   /^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2}(?:\.\d*)?)Z$/.exec(value);
//                  if (a) {
//                      return new Date(Date.UTC(+a[1], +a[2] - 1, +a[3], +a[4],
//                          +a[5], +a[6]));
//                  }
//              }
//              return value;
//          });

//          myData = JSON.parse('["Date(09/09/2001)"]', function (key, value) {
//              var d;
//              if (typeof value === "string" &&
//                      value.slice(0, 5) === "Date(" &&
//                      value.slice(-1) === ")") {
//                  d = new Date(value.slice(5, -1));
//                  if (d) {
//                      return d;
//                  }
//              }
//              return value;
//          });

//  This is a reference implementation. You are free to copy, modify, or
//  redistribute.

/*jslint
 eval, for, this
 */

/*property
 JSON, apply, call, charCodeAt, getUTCDate, getUTCFullYear, getUTCHours,
 getUTCMinutes, getUTCMonth, getUTCSeconds, hasOwnProperty, join,
 lastIndex, length, parse, prototype, push, replace, slice, stringify,
 test, toJSON, toString, valueOf
 */


// Create a JSON object only if one does not already exist. We create the
// methods in a closure to avoid creating global variables.

if (typeof JSON !== "object") {
  JSON = {};
}

(function () {
  "use strict";

  var rx_one = /^[\],:{}\s]*$/;
  var rx_two = /\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g;
  var rx_three = /"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g;
  var rx_four = /(?:^|:|,)(?:\s*\[)+/g;
  var rx_escapable = /[\\\"\u0000-\u001f\u007f-\u009f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g;
  var rx_dangerous = /[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g;

  function f(n) {
    // Format integers to have at least two digits.
    return n < 10
        ? "0" + n
        : n;
  }

  function this_value() {
    return this.valueOf();
  }

  if (typeof Date.prototype.toJSON !== "function") {

    Date.prototype.toJSON = function () {

      return isFinite(this.valueOf())
          ? this.getUTCFullYear() + "-" +
      f(this.getUTCMonth() + 1) + "-" +
      f(this.getUTCDate()) + "T" +
      f(this.getUTCHours()) + ":" +
      f(this.getUTCMinutes()) + ":" +
      f(this.getUTCSeconds()) + "Z"
          : null;
    };

    Boolean.prototype.toJSON = this_value;
    Number.prototype.toJSON = this_value;
    String.prototype.toJSON = this_value;
  }

  var gap;
  var indent;
  var meta;
  var rep;


  function quote(string) {

// If the string contains no control characters, no quote characters, and no
// backslash characters, then we can safely slap some quotes around it.
// Otherwise we must also replace the offending characters with safe escape
// sequences.

    rx_escapable.lastIndex = 0;
    return rx_escapable.test(string)
        ? "\"" + string.replace(rx_escapable, function (a) {
      var c = meta[a];
      return typeof c === "string"
          ? c
          : "\\u" + ("0000" + a.charCodeAt(0).toString(16)).slice(-4);
    }) + "\""
        : "\"" + string + "\"";
  }


  function str(key, holder) {

// Produce a string from holder[key].

    var i;          // The loop counter.
    var k;          // The member key.
    var v;          // The member value.
    var length;
    var mind = gap;
    var partial;
    var value = holder[key];

// If the value has a toJSON method, call it to obtain a replacement value.

    if (value && typeof value === "object" &&
        typeof value.toJSON === "function") {
      value = value.toJSON(key);
    }

// If we were called with a replacer function, then call the replacer to
// obtain a replacement value.

    if (typeof rep === "function") {
      value = rep.call(holder, key, value);
    }

// What happens next depends on the value's type.

    switch (typeof value) {
      case "string":
        return quote(value);

      case "number":

// JSON numbers must be finite. Encode non-finite numbers as null.

        return isFinite(value)
            ? String(value)
            : "null";

      case "boolean":
      case "null":

// If the value is a boolean or null, convert it to a string. Note:
// typeof null does not produce "null". The case is included here in
// the remote chance that this gets fixed someday.

        return String(value);

// If the type is "object", we might be dealing with an object or an array or
// null.

      case "object":

// Due to a specification blunder in ECMAScript, typeof null is "object",
// so watch out for that case.

        if (!value) {
          return "null";
        }

// Make an array to hold the partial results of stringifying this object value.

        gap += indent;
        partial = [];

// Is the value an array?

        if (Object.prototype.toString.apply(value) === "[object Array]") {

// The value is an array. Stringify every element. Use null as a placeholder
// for non-JSON values.

          length = value.length;
          for (i = 0; i < length; i += 1) {
            partial[i] = str(i, value) || "null";
          }

// Join all of the elements together, separated with commas, and wrap them in
// brackets.

          v = partial.length === 0
              ? "[]"
              : gap
              ? "[\n" + gap + partial.join(",\n" + gap) + "\n" + mind + "]"
              : "[" + partial.join(",") + "]";
          gap = mind;
          return v;
        }

// If the replacer is an array, use it to select the members to be stringified.

        if (rep && typeof rep === "object") {
          length = rep.length;
          for (i = 0; i < length; i += 1) {
            if (typeof rep[i] === "string") {
              k = rep[i];
              v = str(k, value);
              if (v) {
                partial.push(quote(k) + (
                        gap
                            ? ": "
                            : ":"
                    ) + v);
              }
            }
          }
        } else {

// Otherwise, iterate through all of the keys in the object.

          for (k in value) {
            if (Object.prototype.hasOwnProperty.call(value, k)) {
              v = str(k, value);
              if (v) {
                partial.push(quote(k) + (
                        gap
                            ? ": "
                            : ":"
                    ) + v);
              }
            }
          }
        }

// Join all of the member texts together, separated with commas,
// and wrap them in braces.

        v = partial.length === 0
            ? "{}"
            : gap
            ? "{\n" + gap + partial.join(",\n" + gap) + "\n" + mind + "}"
            : "{" + partial.join(",") + "}";
        gap = mind;
        return v;
    }
  }

// If the JSON object does not yet have a stringify method, give it one.

  if (typeof JSON.stringify !== "function") {
    meta = {    // table of character substitutions
      "\b": "\\b",
      "\t": "\\t",
      "\n": "\\n",
      "\f": "\\f",
      "\r": "\\r",
      "\"": "\\\"",
      "\\": "\\\\"
    };
    JSON.stringify = function (value, replacer, space) {

// The stringify method takes a value and an optional replacer, and an optional
// space parameter, and returns a JSON text. The replacer can be a function
// that can replace values, or an array of strings that will select the keys.
// A default replacer method can be provided. Use of the space parameter can
// produce text that is more easily readable.

      var i;
      gap = "";
      indent = "";

// If the space parameter is a number, make an indent string containing that
// many spaces.

      if (typeof space === "number") {
        for (i = 0; i < space; i += 1) {
          indent += " ";
        }

// If the space parameter is a string, it will be used as the indent string.

      } else if (typeof space === "string") {
        indent = space;
      }

// If there is a replacer, it must be a function or an array.
// Otherwise, throw an error.

      rep = replacer;
      if (replacer && typeof replacer !== "function" &&
          (typeof replacer !== "object" ||
          typeof replacer.length !== "number")) {
        throw new Error("JSON.stringify");
      }

// Make a fake root object containing our value under the key of "".
// Return the result of stringifying the value.

      return str("", {"": value});
    };
  }


// If the JSON object does not yet have a parse method, give it one.

  if (typeof JSON.parse !== "function") {
    JSON.parse = function (text, reviver) {

// The parse method takes a text and an optional reviver function, and returns
// a JavaScript value if the text is a valid JSON text.

      var j;

      function walk(holder, key) {

// The walk method is used to recursively walk the resulting structure so
// that modifications can be made.

        var k;
        var v;
        var value = holder[key];
        if (value && typeof value === "object") {
          for (k in value) {
            if (Object.prototype.hasOwnProperty.call(value, k)) {
              v = walk(value, k);
              if (v !== undefined) {
                value[k] = v;
              } else {
                delete value[k];
              }
            }
          }
        }
        return reviver.call(holder, key, value);
      }


// Parsing happens in four stages. In the first stage, we replace certain
// Unicode characters with escape sequences. JavaScript handles many characters
// incorrectly, either silently deleting them, or treating them as line endings.

      text = String(text);
      rx_dangerous.lastIndex = 0;
      if (rx_dangerous.test(text)) {
        text = text.replace(rx_dangerous, function (a) {
          return "\\u" +
              ("0000" + a.charCodeAt(0).toString(16)).slice(-4);
        });
      }

// In the second stage, we run the text against regular expressions that look
// for non-JSON patterns. We are especially concerned with "()" and "new"
// because they can cause invocation, and "=" because it can cause mutation.
// But just to be safe, we want to reject all unexpected forms.

// We split the second stage into 4 regexp operations in order to work around
// crippling inefficiencies in IE's and Safari's regexp engines. First we
// replace the JSON backslash pairs with "@" (a non-JSON character). Second, we
// replace all simple value tokens with "]" characters. Third, we delete all
// open brackets that follow a colon or comma or that begin the text. Finally,
// we look to see that the remaining characters are only whitespace or "]" or
// "," or ":" or "{" or "}". If that is so, then the text is safe for eval.

      if (
          rx_one.test(
              text
                  .replace(rx_two, "@")
                  .replace(rx_three, "]")
                  .replace(rx_four, "")
          )
      ) {

// In the third stage we use the eval function to compile the text into a
// JavaScript structure. The "{" operator is subject to a syntactic ambiguity
// in JavaScript: it can begin a block or an object literal. We wrap the text
// in parens to eliminate the ambiguity.

        j = eval("(" + text + ")");

// In the optional fourth stage, we recursively walk the new structure, passing
// each name/value pair to a reviver function for possible transformation.

        return (typeof reviver === "function")
            ? walk({"": j}, "")
            : j;
      }

// If the text is not JSON parseable, then a SyntaxError is thrown.

      throw new SyntaxError("JSON.parse");
    };
  }
}());